manage multiple Gmail accounts
Gmail Manager is a Firefox extension that enables you to keep an eye on multiple Gmail accounts from the Firefox status bar. It can alert you via sound and display a tooltip with previews of new messages that arrive in your Inbox. The program also displays your currently used Gmail disk space and optional mail labels.
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User Reviews

It's nothing fancy or really but it works well. I did get tired of being notified but that's me, others may like being notified by Gmail.
Either way, yes, it does what it says but nothing different than other notifiers in my opinion.
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